nav {
  width: 100%;
  height: 40px;
  display: flex;
  border-bottom: 1px solid #000;
}

nav span {
  width: 80px;
  display: flex;
  justify-content: center;
  align-items: center;
}

nav ul {
  flex: 1;
  display: flex;
}

nav ul li {
  flex: 1;
  list-style: none;
}

nav ul li a {
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  text-decoration: none;
  color: #333;
}

nav ul li .active {
  color: red
}

